For the record Artimisinin, an extract of Chinese wormwood (artemesia annua), 
is the substance being considered for use by the WHO. It is much less toxic 
than other species of wormwood.   Artimisinin has been shown by Henry Lai, Phd, 
to have an affinity for iron compounds in the cells.  He has shown that it is 
not only effective for malaria but for many forms of cancer as well... upon 
contact with the iron molecule an oxidation reaction occurs destroying the 
cancer cell on contact.  Most cancer cells contain high amounts of iron.